【单选题】Molds cannot produce their own food ______ their nourishment from living on dead organic matter or on other living matter.
A．obtain
B．obtaining
C．but obtain
D．is obtained
【单选题】Molds cannot produce their own food ______ their nourishment from living on dead organic matter or on other living matter.
A．obtain
B．obtaining
C．but obtain
D．is obtained
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